Answer:
3: 3 x ( 3 x + 5 ) or B
4: 10 m ( 2 n − 3 ) or B
5: 4 x y ( 2 x y − x − 3 ) or D
Answer:
421 3/50 - 212 9/10 = 208.16 or 5204/25
Step-by-step explanation:
To solve the expressions you could change the values into an improper fraction to solve easily
421 3/50 - 212 9/10 =
421 3/50 = 421 × 50 + 3 / 50 = 21053/50
212 9/10 = 212 × 10 + 9 / 10 = 2129/10
subtract the fractions as follows
21053/50 - 2129/10 =
common factor of the denominator is 50
21053 - 10645 / 50 =
subtract 10645 from 21053
10408/50 = 5204/25 in fraction or 208.16 in decimal
From a list of ten books, 210 ways to select a group of 4 books.
A combination is a selection of all or a portion of a group of items, regardless of the sequence in which the items are chosen.
The number of ways to select a group of 4 books from a list of 10 books can be calculated using the combination formula:
nCr = n! / (r! x (n-r)!)
Where n is the total number of items (in this case, 10 books) and r is the number of items to be selected (in this case, 4 books).
Plugging in the values, we get:
10C4 = 10! / (4! x (10-4)!)
= 10! / (4! x 6!)
= (10 x 9 x 8 x 7) / (4 x 3 x 2 x 1)
= 210
Therefore, there are 210 ways to select a group of 4 books from a list of 10 books.
To learn more about the combination;
#SPJ3
First you have all ten books, but then every time after, you loose one because you can't put the same book in the group twice.
10 * 9 * 8 * 7 = 5040 groups
Passes through the points (4,2) and (6,8)
square
heptagon
14-gon